Suspicious Russian Company - Devops Engineer FacilityOS Employee Review

Worked there for one day and was fired without notice or explanation, I passed a lengthy hiring process, and all the required checks. After one day of reading paperwork and submitting my personal documents (SIN and passport) for photocopying I was dismissed. I am Ukrainian and the senior management I met before being fired without cause were Russian. While I can't prove this was the cause, I've been over all other possible reasons and nothing else makes sense.